Metric System

Metric System is in General Things.

Culture, General Things, Distance Metric System

Distances Greater Than a Metre

Gigametre

Gigametre. One thousand million metres. Abbreviation Gm.

Kilometre

Kilometre. One thousand metres. Abbreviation Km.

                    Mercury ...
                
                    is, on average, 0.39 AUs from the Sun.
                
                    has a diameter of 2440 Kms; around one third of the Earth.
                
                    has an eccentic orbit with the closest distance to the Sun being 47 million kilometers, and the farthest distance being 70 million kilometers.
                
                    has a year of 88 days.
                
                    spins on its axis every 59 days.
                
                    is tilted at 2 degrees.
                
                    formed around 4.5 Billion years ago.

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                    Venus                

                    is, on average, 0.67 AUs from the Sun.
                
                    has a diameter of 12.104 Kms; 95% of that of Earth.
                
                    has a year of 225 Days.
                
                    has a tilt of 3 degrees.
                
                    Is known as both the Morning Star and the Evening Star since it is brightest from the Earth at both sunrise and sunset.

Megametre

Megametre. One million metres. Abbreviation Mm.

Metre

Metre. The standard unit of distance in the Metric System.

Culture, General Things, Mass Metric System

Gram

Gram. The standard unit of distance in the Metric System. Abbreviated as g.

Masses Greater Than a Gram

Exagram

Exagram. One million million million grams.

Gigagram

Gigagram. One thousand million grams.

Kilogram

Kilogram. One thousand grams.

Megagram

Megagram. One million grams.

Petagram

Petagram. One thousand million million grams.

Teragram

Teragram. One million million grams.

Yottagram

Yottagram. One million million million million grams.

Zettagram

Zettagram. One thousand million million million grams. It is abbreviated as Zgs, or, possibly g²¹.

Culture, General Things, Metric System, Non-Metric Units

Non-Metric Distances

Astronomical Unit Length

Astronomical Unit Length. 149,597,870,700 metres ie 150 Gigametres. The average distance from the Earth to the Sun.

Light Year

Light Year. The distance travelled by light in one year. 9.46×10¹² km.

The Milky Way Galaxy is one of many galaxies that form the Universe, each of which, on average, contains one hundred million stars. NASA has estimated there are 200 billion galaxies with the total number of stars being between 10¹⁹ and 10²⁴ stars.

The Milky Way contains between 100 and 400 billion stars, and around the same number of planets. The Solar System is located 27,000 light-years from the centre of the Milky Way ie 255,420,000,000,000,000 Km.